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   71185
   Very distant clusters AXJ2019+1127 and MS1054-0321, at the redshift
   larger than 0.6 observed by ASCA and ROSAT show remarkable different
   characteristics from nearby clusters. The two clusters contain only 1/5
   - 1/2 of ICM of nearby clusters with same plasma temperature. X-ray
   spectrum of AXJ2019+1127 exhibits strong iron line whose abundance
   reaches 1.7 cosmic values although MS1054-0321 indicate only upper
   limit. On the other hand, clusters at 0.1<z<0.6 look like those at
   z<0.1. The results mentioned above indicate a hint of strong evolution
   at z>0.6. However, only two clusters at z>0.6 have been observed with
   ASCA. Therefore, we propose observation of a distant cluster in order
   to investigate possible cluster evolution at z>0.6.
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